Red Hat Bugzilla – Bug 980869
Boxes requires to set SELinux context on read-only NFS storage
Last modified: 2015-02-17 10:48:47 EST
Description of problem:
(gnome-boxes:3884): Boxes-WARNING **: wizard.vala:208: Unable to start domain: unable to set security context 'system_u:object_r:virt_content_t:s0' on '/mnt/globalsync/fedora/fedora-alt/stage/19-RC3/Fedora/x86_64/iso/Fedora-19-x86_64-netinst.iso': Read-only file system
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Have read-only NFS mount with ISO image
2. Run Boxes.
3. Try to install using image from NFS.
Box creation failed.
Box is created and booted.
NFS is a world of hurt wrt to SELinux, since it doesn't actually support labelling at all currently. Libvirt has code to try to cope with this by detecting specific error codes we might get back from NFS. This doesn't seem to working here though, because it seems we're getting EROFS back before it even realizes that it would be ENOTSUP.
That said the EROFS error code is possible to hit with any filesystem, not just NFS. So I'm undecided whether libvirt should cope with EROFS explicitly, or the application be required to set <seclabel relabel=no> against any image that is located on a read-only filesystem. Something to discuss on the libvirt mailing list
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